What is the voltage between any two hot lines in a 208 volt WYE power supply?

What is the voltage between any two hot lines in a 208 volt WYE power supply?

• A. 120V
• B. 208V
• C. 240V
• D. 277V

Answer: (B)

In a 208 volt WYE power supply, the voltage between any two hot lines is indeed 208 volts. The WYE (or star) connection in three-phase electrical systems features three phases, each of which is 120 degrees apart in phase angle. In this setup, the voltage between the neutral point (which is at ground potential) and each hot line is 120 volts. When measuring the voltage between any two hot lines in this configuration, the calculation involves using the formula for the line-to-line voltage in a three-phase system. Specifically, that voltage is determined by multiplying the phase voltage (which is 120 volts in this case) by the square root of 3 (approximately 1.732). Therefore, you calculate it as: \[ V_{LL} = V_{PH} \times \sqrt{3} \\ V_{LL} = 120V \times 1.732 \approx 208V \] This means that the voltage observed between any two hot lines in a WYE configuration with a line-to-neutral voltage of 120 volts will always yield approximately 208 volts line-to-line. Hence, the correct answer is 208 volts, as it reflects the characteristic of this specific wiring arrangement.

In a 208 volt WYE power supply, the voltage between any two hot lines is indeed 208 volts. The WYE (or star) connection in three-phase electrical systems features three phases, each of which is 120 degrees apart in phase angle. In this setup, the voltage between the neutral point (which is at ground potential) and each hot line is 120 volts.

When measuring the voltage between any two hot lines in this configuration, the calculation involves using the formula for the line-to-line voltage in a three-phase system. Specifically, that voltage is determined by multiplying the phase voltage (which is 120 volts in this case) by the square root of 3 (approximately 1.732). Therefore, you calculate it as:

[ V_{LL} = V_{PH} \times \sqrt{3} \

V_{LL} = 120V \times 1.732 \approx 208V ]

This means that the voltage observed between any two hot lines in a WYE configuration with a line-to-neutral voltage of 120 volts will always yield approximately 208 volts line-to-line. Hence, the correct answer is 208 volts, as it reflects the characteristic of this specific wiring arrangement.